Auriga is a prominent constellation high in the Northeast. It is north of Taurus, our Feb 2012 constellation of the month, and east of Perseus, our Jan 2012 constellation of the month. The band of the Milky Way passes through Auriga between Perseus to the West and Gemini to the East. Auriga is shaped like a pentagon, or a child's drawing of a house. It has one magnitude 0 star, Capella, and the other four are 2nd magnitude.
Like so many other stars, Capella is a multiple star. It is comprised of 4 stars, made up of 2 binary pairs which orbit around each other. One is a pair of bright yellow stars in the same category (G) as our Sun. They are each 10 times as large as the Sun. This may be because they are expanding on their way to becoming Red Giant stars, which is near the final stage of the life of stars like the Sun. The other two are red dwarf stars. These are small-mass stars which are relatively cool. Red stars – like red flames on earth are cooler than yellow stars like the Sun, which are, in turn, cooler than blue or white stars. Being of lower mass and cooler than other stars, they evolve more slowly and live longer than massive blue or white stars.